Lubricant



Patented Mar. 11, 1930 UNITED STATES PATENT OFFICE EDWARD A. BUDIGIER, OF BALTIMORE, MARYLAND, ASSIGNOR- TO STANDARD OIL DEVELOPMENT COMPANY, A CORPORATION OF DELAWARE LUBRICANT No Drawing.

This invention relates to lubricants and will be understood from the following description.

Where petroleum oil containing naphthenic compounds is distilled in the presence of soda, particularly sodium hydroxid, and lubricating stocks are taken ofi overhead, there remains in the still a dense residuum which heretofore has been considered as waste. Such residuum is found to contain very heavy oil and sodium naphthenate, and in accordance with the present invention such a residuum is compounded with a thinning oil of suitable character to produce lubricants of high viscosity and relatively low cold test. Depending upon the precise duty in view for the products, some latitude in choice of thinning oil and proportions may be had. Advantageously the thinning oil may itself have some viscosity, for instance 65200 sec. Saybolt at 100 F. and the amounts of thinning oil used may be for instance 1050%. As an example illustrating the invention but without implying any limitation in the particular crude source, or the particular thinning oil, the following may be noted: A distillation residuum from rerunning a lubricating stock from West Columbia crude with caustic soda was com- 3 pounded in the amount of 65% with of a lubricating distillate of 120 sec. Saybolt viscosity at 100 F. obtained from Mexican crude. The resulting product had a viscosity of 137 sec. Saybolt at 212 F. and a pour 35 test of 35 F.

In general the products obtained in accordance with this invention have a high viscosity, in excess of 125 sec. and more particularly 135-140 sec. Saybolt at 212 F., in

conjunction with a low cold test, for instance a pour of less than 37 F.

What I claim is:

1. A lubricant comprising a residuum from the distillation of a naphthenic crude petroleum in presence of soda compounded with a mineral lubricating oil, the product having a viscosity of 135140 sec. Saybolt at 212 F. and a pour test around 35 F.

2. A lubricant comprising a heavy oil containing sodium naphthenate compounded Application filed April 23, 1924. Serial no. 708,334.

with a mineral thinning oil having a viscosity within the approximate range of to 200 sec. Saybolt at 100 F., the product having a viscosity of 1354410 sec. Saybolt at 212 F. and a pour test not higher than 37 F. 5

3. A lubricant comprising a heavy oil containing an alkaline naphthenate compounded with a substantial portion of a mineral lubricating-distillate, the product having a viscosity in excess of 125 sec. Saybolt at 212 F. and a cold test not higher than 37 F.

EDWARD A. RUDIGIER. 

